Buttercream Frosting - cooking recipe

Ingredients

1 c. milk
3 Tbsp. flour or cornstarch
1/2 c. butter
1/2 c. shortening
1 c. sugar
1 tsp. vanilla

Preparation

Cook milk and flour or cornstarch until thick; let cool. Cream together butter, shortening, sugar and vanilla.
Add flour mixture; beat 10 minutes.